The Extraction of Divalent Manganese,Cobalt, Copper,Zinc, and Cadmium from Hydrochloric Acid Solutions by Tri-n-octylamine

Abstract

The distribution of divalent manganese, cobalt, copper, zinc, and cadmium between hydrochloric acid solutions and solutions of tri-n-octylamine (TOA, R₃N) in benzene has been investigated under different conditions. It is found that the extraction of these divalent metals by TOA proceeds as MCl₂(aq) + 2R₃NHCl(org) ? (R₃NH)₂MCl₄(org). The electronic, electron spin resonance, and infrared spectral results indicate that all the complexes formed in the organic phases are in a tetrahedral arrangement. Further, the stability constants of the aqueous chloro complexes of divalent manganese, cobalt, copper, and zinc are determined on the basis of the equilibrium equation.